【作者】 赵宝成；

【导师】 顾强；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2003， 博士

【摘要】 偏心支撑钢框架在弹性阶段刚度很大，能够满足高层钢结构侧移要求。在罕遇地震时，由于耗能梁段屈服进入塑性，结构有很强的耗能能力和延性，是适用于高烈度震区的一种有效的抗侧力结构体系。国内外许多学者对此进行了试验和理论研究，并将研究成果应用于工程实践。本文以工程应用为目的，研究和探索了各种典型的偏心支撑钢框架在循环荷载作用下的滞洄性能和破坏机理，并提出了抗震设计对策和建议。 本文提出了应用子结构法联合梁单元与空间退化曲壳单元分析偏心支撑钢框架耗能性能及耗能梁段破坏机理的非线性有限元分析模型。在有限元分析过程中，对于未进入塑性部分的梁、柱及支撑采用梁单元，梁单元考虑了几何非线性，对于进入塑性部分的耗能梁段采用空间退化曲壳单元，曲壳单元考虑了几何和材料的双重非线性，材料的强化采用了混合强化法则，非线性方程通过Newton-Raphson迭代结合增量法求解。在整体结构中采用两种单元较精确的分析偏心支撑钢框架的滞洄性能及破坏机理的方法，在国内外均属首次。本文编制了梁-壳元非线性有限元分析程序BSNFEM，并进行了算例分析，验证了程序的可靠性。 应用BSNFEM非线性有限元程序对偏心支撑钢框架进行了循环加载分析。对耗能梁段的长度、耗能梁段腹板的厚度、耗能梁段翼缘的厚度、耗能梁段加劲肋的间距、耗能梁段加劲肋的厚度、支撑的夹角等因素的改变对D形、K形偏心支撑钢框架耗能的影响，前人已有一些研究，本文对这些因素的影响进行了全面系统的分析，完善了理论分析的不足；而结构高跨比、支撑刚度、支撑与梁的连接形式等因素对D形、K形偏心支撑钢框架破坏机理的研究以及各种因素对Y形偏心支撑钢框架破坏机理的影响，则很少有人涉及，本文对此也进行了深入系统的分析，填补了这一研究空白。 最后，根据有限元研究结果，提出了抗震设计对策和建议。 本文全面、系统、深入地分析了三种典型偏心支撑钢框架结构在循环荷载作用下的破坏西安建筑科技大学博士学位论文机理，对于修订有关规范、指导工程设计有重要的参考价值，也为进一步研究偏心支撑钢框架结构的抗震性能打下了良好的基础。更多还原

【Abstract】 Eccentrically braced steel frames are a lateral load-resisting system which apply high intensity area and it can provide the high elastic stiffness that met higher steel building drift requirement. The links of Eccentrically braced steel frames sustain large inelastic deformation without loss of strength under severe earthquake loading which demonstrate excellent energy-dissipation capacity and ductility. It was tested and theories studied by many scholars at home and broad, and as a result, the achievements have been applied engineering practice. This p aper aim at the project application, study on collapse mechanism and design criteria of eccentrically braced steel frames under cyclic Load.A new nonlinear finite element model which applies subsystem connect beams element and space degenerate shell element to analyze eccentric braced structural energy-dissipation and links collapse mechanism is presented in this paper. In the process of finite element analyzing, the beam, column and b race that not enter the plastic parts adopt bearn element that considered geometry nonlinear. The links entering plastic adopt space degenerate shell element that considered the nonlinear large-deformation, together with mixed hardening rule, which linearly combines isotropic and kinematic hardening. The method applied two elements to analyze the collapse mechanism and hysteretic behavior of eccentrically braced steel frames under cyclic Load in structure at first time. Computer program BSNFEM is complied. Good agreement is found between the theoretical predications and experiment result.This paper applies nonlinear finite element program BSNFEM to analyze the behaviors of eccentrically braced steel frames under cyclic load. The study that comprehensive and systematic analyze the factor of links length, thickness of links flange, distance of links rib, thickness of links rib and angle of brace to be changed affect energy-dissipation capacity of D shape and K shape eccentrically braced steel frames have been some studied before. This paper fills the black in the filed factor of high-span ratio, brace stiffness and brace-to-beam connections to be changed affectenergy-dissipation capacity of D shape and K shape eccentrically braced steel trames and any factor to be changed affect energy-dissipation capacity of Y shape eccentrically braced steel frames.Suggestions for seismic design based on FEM analysis are presented at last. The study that analyzing three kind of eccentrically braced steel frames is rather comprehensive and systematic, and the conclusions can be useful for revising design code, guiding design of engineering, and provide good basis for further to study seismic-resistant behavior of eccentrically braced steel frames.更多还原